Bug: Edges of an env_projectedtexture are stretched out when playing back a webm video through it.

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Describe the bug

https://github.com/StrataSource/Portal-2-Community-Edition/assets/140695311/b44414e3-6412-4e1b-947f-d8a8b1f56a64

Here is a video of the issue. The edges of the projected texture which are outside of it's fov in hammer are stretched out.

Issue Map

Most likely any map with an env_projectedtexture entity with a moviename kv set to a video.

I have provided the .bsp and the .vmf file.

webm_projectedtexture_issuemap.zip

To Reproduce

1. Place an env_projectedtexure entity inside a map.
2. Add a new KV named moviename and set its path to a .webm video (e.g, media/turret_dropin.webm), since it's currently missing from the fgd at the time of writing this bug report.
3. Compile the map and make sure the env_projectedtexure is turned on and observe the issue

Operating System

Windows 11 22H2 Build 22621.2715